Here are seven must-see museums to explore with the little ones. The National Center for Civil and Human Rights including John Lewis, Andrew Young and the wives of Joseph Lowery and Ralph David Abernathy National Civil Rights Museum Now, the site

Long lines, limited tickets during last week of free entry to civil rights center

At the time of the announcement, the center said it expected tens of thousands of visitors during the free period, and people are certainly showing up.

With only one week left to take advantage of the special offer, lines are long and tickets are limited. In fact, many have been posting videos and photos of the large crowds on social media.

Want to make sure you snag your free tickets before Feb. 28, the last day of the special offer? Here’s what you should know.

All tickets are distributed on a first come, first served basis at the box office only. You cannot reserve tickets online prior to your visit. The box office opens daily at 10 a.m., although closing hours are subject to change.

While the center will try to accommodate timed entry requests, you may not receive your requested entry time due to high volume attendance. However, you will be offered the next available time slot.

Same-day, timed entry tickets go fast. The center could reach capacity for the day three to four hours after the box office opens.

Lines start to form around 9:30 a.m. The center suggests that you plan to come early.

The museum is open from 10 a.m. to 5 p.m. on weekdays. There are extended hours on the weekends in February. On Saturday and Sundays, it will be open from 10 a.m.to 7 p.m. Check the website frequently for updated hours of operation.

Follow the center on Twitter and Facebook for updates. The staff responds quickly to questions.